Have a gigantic WXR file and want it split into smaller parts? Download this free application. It requires a Windows PC and the .NET 2.0 framework (which most people have installed, I think.)
If you run Windows XP and don't have .NET 2.0, you can download .NET 2.0 for free from Microsoft's website or through Windows Update. (Vista and Win7 users already have .NET installed)
Why did I write this program? Well, a friend of mine needed help moving a 32MB WXR file from one WordPress server to another and there were 2700+ entries in the file and her new server was choking on the large WXR file. Instead of splitting it "by hand" into 100 item chunks (which would have taken forever), I wrote this program to do the heavy lifting for us.
Check it out and let me know how you like it.